This one of my favourite things to do in aram so far I had 8 times where I managed to backdoor my opponents and win and only fail once and loose.
What you need to set up back door:
1.All your opponents Turrets destroyed and their center armory is destroyed
2.All but 1 of your Turrets destroyed
3.Your team get annhilated at opponents base and you also die first if possible.
- Have camera on a bushes near the opponent gold
Congrats now all you do is wait till opponents see all 5 opponents are at your base and then it easy victory
Your 4 teammates should be able to hold out your turret Long enough